51011055102 has 64 divisors (see below), whose sum is σ = 118398551040. Its totient is φ = 14350887936.

The previous prime is 51011055097. The next prime is 51011055133. The reversal of 51011055102 is 20155011015.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 770799 + ... + 834357.

It is an arithmetic number, because the mean of its divisors is an integer number (1849977360).

Almost surely, 2^51011055102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51011055102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59199275520).

51011055102 is an abundant number, since it is smaller than the sum of its proper divisors (67387495938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51011055102 is a wasteful number, since it uses less digits than its factorization.

51011055102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63865.

The product of its (nonzero) digits is 250, while the sum is 21.

Adding to 51011055102 its reverse (20155011015), we get a palindrome (71166066117).

The spelling of 51011055102 in words is "fifty-one billion, eleven million, fifty-five thousand, one hundred two".